Pressure-reducing valve.



PATENTED JULY 7, 1908.

T. ROBINSON. PRESSURE REDUCING VALVE.

APPLICATION FILED MAR. 2, 1908.

FIG. 2.

INVENTOR WITNESSES UNITED. STATES PATENT OFFICE.

THOMAS ROBINSON, OF LOW BENTHAH, ENGLAND.

PRESSURE-REDUCING VALVE.

T 0 all whom it may concern:

Be it known that I, THOMAS RoBrNsoN, a subject of the King of Great Britain and Ire land, residing at Low Bentham, in thelVest Riding of the county of York, England, have invented a new and useful Improvement in Pressure-Reducing Valves, of which the following is a specification.

This invention relates to pressure reducing valves of the type in which a high pressure inlet lift valve is automatically controlled by means ofa low pressure piston workingwithin the outlet end of the casing.

My improved apparatus is intended mainly for use as an automatic pressure reducing valve for water mains, but it is equally applicable for use in connection with steam, compressed air, and other high pressure fluids.

Description Drawings.

Figure 1 is a front elevation (in section) of my improved automatic reducing valve. Fig. 2 is a plan of same. Fig. 3 is an elevation of the hollow piston rod E detached. Fig. 4 is an end elevation, and Fig. 5 a plan, showing details of the grooved clip B. Fig. 6 is a cross-section of the high pressure chamber B, showing the internal collar H with passages or ducts 1.

Similar letters of reference are employed to indicate corresponding parts throughout the several views.

My improved apparatus com )rises essentially a high pressure inlet nozz e A, a high pressure chamber B, a low pressure chamber C, an intermediate chamber 1), a lift valve J controlled by a piston rod E and piston K working within the chamber a compression ring L, a guide collar H, a central passage F (within the piston rod E) connecting the said high and low pressure chambers B, O, a low pressure outlet G, and a valve lock ing device consisting of grooved clip B, rocking lever S, and thumb lever T.

The inlet nozzle A from the high pressure main delivers into the high pressure chamber B, which is formed with an internal guide collar H having passages or ducts I. The piston rod E, working through this collar ll, terminates at the high pressure end in a valve disk J abutting on the nozzle A, and terminates at the low pressure end in a piston K working within the chamber O, which is bored to receive it. The piston rod E is formed with an internal passage E, which is Specification of Letters Patent.

Application filed March 2, 1908.

Patented July '7, 1908.

Serial No. 418,882.

open to the chamber O at the low'pressure end, and which communicates with the high pressure chamber B by way of perforations U. The joint between the chambers B and D is made tight by means of a compression ring L fitting within a recess M in the flange so as to embrace the piston rod E, the said intermediate chamber D having an opening V at the top, and being provided with a small drip ipe N to indicate and take away any possiblb leakage. The end cover 0 of the casing is formed with an internal stop or strms P to limit the movement of the piston In.

The respective areas of the nozzle A and piston K are so arranged as to be inversely proportionate to the pressure at the inlet nozzle A and the pressure required at the low pressure outlet G. The valve therefore remains closed and in perfect equilibrium so long as these pressures remain unaltered, while on any reduction of ,)ressure. taking place within the chamber O the valve is momentarily o ened and the pressures automatically read}usted, after which the valve is automatically closed. Thus the valve, when in operation, works with a slight pulsating or vibratory movement, which allows free passage for the fluid from the high pressure main and at the same time automatically maintains the reduction of pressure in the exact proportion desired.

When the apparatus is intended for use in connection with water mains, the valve disk J and compression ring L are preferably of rubber and the piston K in the form of an expansible cup-shaped leather, as shown in the drawings, the valve disk being retained in position by a screwed cap Q,but these valve arrangements may of course be varied in accordance with requirements.

The casing is preferably made in several parts as shown, but the design may be varied as found convenient.

The valve locking device consists of an adjustable clip R carried by the piston rod E, a curved rocking lever S which passes through the opening V and is removably pivoted in lugs \V on the casing, and a thumb lever T pivoted upon a web X of the casing and having a curved inclined slot Y adapted to engage a small pin Z on the end of the rocking lever S. The upper part of the clip R is formed with cross-shaped grooves-1, to receive the inner end of the rocking lever S and to engage with a pair ofpins 2 carried thereby. On the thumb lever T being moved forward (into the position shown in'the drawing), the pin Z is depressed by contact with the curved inclined slot Y, this movement closing the Valve and looking it firmly in its closed position. On the thumb lever T being thrown back, the pin Z is released and the valve becomes free to operate automatically in its ordinary manner.

I claim:

In a pressure reducing valve, the combination, with a high-pressure cylinder provided with an inlet nozzle at its front end and having a perforated guide-ring adjacent to the cylinder and provided with an outlet at its rear end, a packing-ring secured to the adjacent ends of the said cylinders, a tubular piston-rod which slides in the said guide-ring and packing-ring and which has a hole in its front end portion for connecting the two said cylinders, a valve for closing the said inlet-nozzle carried by the front end of the said pistonrod, and a iston secured on the rear part of the said piston-rod and slidable in the said low-pressure cylinder.

THOMAS ROBINSON.

l/Vitnesses ALLAN BENNETT, SAMUEL BURGESS. 

